Saunders, 29, recently split with Hearn’s rival promoter Frank Warren after becoming frustrated with a lack of direction in finding new opponents.
But since teaming up with Hearn, the Hatfield-born fighter already cuts a reinvigorated figure, eager to chase huge fights with the likes of Canelo Alvarez and Gennady Golovkin.
Back in May, Saunders became a two-weight world champion after easily outpointing Shefat Isufi for the WBO world super-middleweight title.
Despite his insistence that he can fluctuate between both super-middleweight and middleweight, where he also won world title gold, Saunders believes his Matchroom debut will be at 168lbs.
He told Express Sport: “I’m WBO super-middleweight champion of the world, so [my debut] will have to be at 168, I’ll leave that with my management and Eddie to sort out. My date and opponent will be sorted this week and my opponent will be finalised then.”
Promoter Hearn added: “His next fight will be a defence of his title at 168lbs [in October or November]. Domestically, you’ve got Callum Smith and Chris Eubank Jr, they’re two good fights.
“Internationally you’ve got Canelo, Golovkin, Danny Jacobs, Demetrius Andrade, all those fights.
“And in 2020, Billy Joe will fight three times and every fight will be a mega-fight. Whether that comes at end of October or beginning of November, we’ll see. The aim is to get him out, firing on all cylinders.”
Saunders, who holds big wins over the likes of Andy Lee, Chris Eubank Jr and David Lemeuix, has his eye on one man in particular, however.
He added: “It’s got to be Canelo. The stature of who he’s beat, who he’s been in the ring with, Floyd Mayweather’s the only man to beat him and it’s a fight that I know I can win.
“I know that my style, for one, could cause Canelo problems, but also my will to win. Because whatever he brings… he can hit me with one punch I’ll have to hit him with two, he hits me with two, I’ll hit him with three.
“I’m up for these big fights because I’ve been talking about them long enough now, I’m on the right track for them to happen, I’ve got to back up my talk, I’ll fight him wherever, whenever.”
Saunders was scheduled to face Hearn’s own Demetrius Andrade last year before failing a Voluntary Anti-Doping Association [VADA] test in which a banned substance, thought to have come from an over-the-counter nasal spray, oxilofrine was detected.
A comeback win over Charles Adamu was followed by the world title victory over Isufi three months ago.
Saunders said: “After the Shefat Isufi fight I was looking around thinking ‘who can I look for?’, I’ve tried Canelo before and [Gennady] Golovkin twice. [Chris] Eubank Jr is hard to make a deal with. Callum Smith, there was an offer but as Eddie said it wasn’t the right offer.
“I didn’t really know where else to go, it was inevitable that I was going to come to Matchroom.”